Update to am-utils 6.2rc1.

Unlike 6.1.5, it actually builds on netbsd-6, but unfortunately not on
OpenIndiana 151a7.

There's reams of changes in ChangeLog.
Import am-utils-6.2nb20130830 as wip/am-utils-git.

An automounter maintains a cache of mounted file systems. File systems
are mounted on demand when they are first referenced, and unmounted
after a period of inactivity. This helps to centralize all file system
access, provide a uniform site-wide namespace, and minimize downtimes
for clients.  The Berkeley Automounter, Amd, may be used as a
replacement for Sun's automounter.

This package builds a development version from the tip of the git
source repository.
Add am-utils-git, the development version.